MST450B-0012-FT-N0SN-NNNN Bosch Rexroth Indramat
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MPN: R911320939
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The Bosch Rexroth Indramat MST450B-0012-FT-N0SN-NNNN is part of the MST Synchronous Torque Motors series and features a rated power of 6.8 kW with a rated torque of 540 Nm. This motor uses water cooling with an open aluminum cooling jacket, has a cooling jacket length of 120 mm, and a stator mass of 31 kg. It operates at a rated speed of 120 rpm and supports a maximum current of 70 A with a torque constant of 24.55 Nm per amp.
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Product Description:
The MST450B-0012-FT-N0SN-NNNN is a frameless synchronous torque motor stator developed by Bosch Rexroth Indramat for the MST Synchronous Torque Motors series. It is built to supply high stall torque directly to a machine shaft, removing gearboxes in applications such as rotary tables and indexing drives where precise, low-speed control is required. Its frameless design lets the stator be integrated directly into the machine structure, which helps reduce backlash and improve rotary positioning accuracy. This layout is suited for direct-drive axes that require repeatable motion without gearbox wear or added transmission elements.
This stator relies on water cooling; a closed circuit draws heat through an open aluminum cooling jacket so the windings stay below their thermal limit even under high load. The outside diameter of 480 mm sets the mounting envelope, while the motor’s electromagnetic core is arranged in 30 pole pairs for smooth operation at slow rotational speeds. During short overloads it can deliver 1200 Nm of peak torque, while its continuous operating point is 540 Nm at 120 rpm, yielding 6.8 kW of mechanical output without gear multiplication. Maximum phase current reaches 70.0 A during acceleration events, and the 1.48 Ω winding resistance helps limit steady-state copper losses. The winding inductance filters current transients, improving current-loop stability in the drive amplifier.
The thermal and electrical design uses a rated phase current of 22.0 A, a value that the drive can supply continuously without exceeding Class F insulation limits. The motor produces torque in direct proportion to current at a constant of 24.55 Nm/A, which simplifies drive tuning because commanded amperes translate linearly into shaft torque. Magnetic and copper mass are contained in a 31.0 kg stator body, and the 120 mm cooling-jacket length allows integration into machinery with shallow axial space. The relatively high inductance of 19 mH eases switching-frequency requirements on the inverter and reduces ripple torque at low speeds.
Frequently Asked Questions about MST450B-0012-FT-N0SN-NNNN:
Q: What is the maximum torque capability of the MST450B-0012-FT-N0SN-NNNN motor?
A: This model provides a maximum torque output of 1200 Nm.
Q: What type of cooling does the MST450B-0012-FT-N0SN-NNNN use?
A: The MST450B-0012-FT-N0SN-NNNN features a water cooling system.
Q: What is the rated speed of the MST450B-0012-FT-N0SN-NNNN?
A: The rated speed for this motor is 120 rpm.
Q: What is the stator mass of the MST450B-0012-FT-N0SN-NNNN?
A: This motor is built with a stator mass of 31.0 kg.
Q: What is the winding resistance of the MST450B-0012-FT-N0SN-NNNN at 20 °C?
A: The winding resistance at 20 °C for this model is 1.48 Ω.
